Improvement in saw-gtjmmers



MWN eggwus NELSON JOHNSON,.OF JASPER, NEW YORK.

Letters Patent o. 88,17 6, (lated Malc7z223, 1869.

I INIPROVEMENT IN SAW-GUMMERS.

The Schedule referred to in these Lettere Patent and making part of the same.

T o all whom it may concern Be it known that I, NELSON JOHNSON, of Jasper, in the county of Steuben, and State of New York, have invented certain new and useful Improvements in Saw- Gummers; and I do hereby declare that the followingr is a suiciently full, clear, and exact ,description thereof, to enable one skilled in the art to which my said invention appertains to make and use it,'ret`erence being had to the accompanying drawings, which are made part of this specification.

My invention relates to certain improvements in machines, or tools for gumming saw-teeth; and

It consists- First, in the provision of a suitable bail for supporting the device on the saw, and a novel arrangement of the clamping-screws; and

Second, in mountingr the gumming-roller, or cutter in a laterally-adjustable frame, so as to adapt it to be readily used for its entire length.

In the drawingsy Figure 1 is a plan View of a saw-gummer embodying my improvements.

Figure 2 is a sectional elevation of the same, in position on the saw, the plane of section being indicated by the line :zz-x, tif. 1.

Figure 3 isa perspective view of-an Emmerson gumbme, provided with a modied form of my supporting- The stock of my improved glimmer, figs. 1 and 2, may consist ofv a plate, or frame, A, of proper shape to adapt itto support the cutter, provided with rearwardlyprojecting arms A* A, for the reception of the attaching and supporting-devices, and in front with a suitable handle A2, by which to hold it up against the tooth; all of which parts may readily be cast in one piece, as represented.

B is a rectangular frame, or carriage, provided with suitable bearings for the reception of the gummingroller, or cutter G, and a screw, D, and adapted to slide within ways a a, on the stock A, said ways having a dovetail, or other suitable form, in cross-section, as represented inig. 2, to support the frame against vertical displacement.

The cutter C is composed of hardened steel, provided with thc usual burr, and either of straight or spiral form. I

One of its pivots o is extended, and provided with an angular end, c', for the reception of a crank by which to operate the cutter.

The screw D is held from longitudinal displacement in the end-piece a* of the way of thc cutter-carriage B, and engaging with the female screw-in said carriage, adjusts the carriage as desired, by its rotation, it being provided with a thumb, or other suit-able head, d, by which to turn it.

The rearwardly-projecting arms of the stock are separated by a slot, E, of sudicient width for lthe reception of thc greatest thickness of saw which the stock` is adapted to operate on, and which extends a suficient distance in front of the cutter to admit of l the different forms of teeth being introduced, in the manner shown in fig. 2. v

The separate arms are further provided with slots a for the reception of a bail, F, and with a number of transverse pcrforations al* for the reception of thumb- Screws G G; that part ofthe arms outside ofthe slot a only, however, being threaded for the reception of said screws, and themselves partially uuthreaded; as represented in tig. 1.

These screws clamp the saw-blade, and by their number and arrangement, serve to ei'ectuallyprevent any wabbling, or reeling of the tool during its operation, which movement tends to make an irregular and rounded edge, and which cannot be prevented with a single pair of clamping-screws. A number of perforations is provided for the reception of the screws, as shown in fig. 2, so as to allowtheir position to be adjusted to suit diiierent sizes of saws.

llhe bail F may be formed in one piece, of wrought4 iron or other suitable met-al, and is formed with a V-shaped, or chisel-edge, f, for its bearing-surface, and its widened extremities are provided with a number of corresponding perforations f, for the -reception of its attaching-screws, which may befeither G, as shown, or G'.

The bail, being adjusted to suit the size of saw which is to be gummed, by means of the perforations at f', is applied to the saw, as represented in iig 2, resting on the back ot' 4the tooth, or on the blade in rear thereof', its sharp bearing-edge adapting it to hold in whatever position placed.

The object of the bail is to support the tool against drifting down and back under the pressure requisite in gumming the tooth, the clamping-screws usually employed having been found entirely inadequate for that purpose, the Stock being often burst open in attempting to clamp it sniiiciently tight by them. The screws, in conjunction with the bail7 help to prevent the backward displacement, and the one on which the bail is hinged, forms the fulcrum ot' the tool. They are, however, employed by me chieily to Support the tool againstside-movement, as before explained.

In tig. 2, the bail is represented as consisting of two bars Fi, having suitable eyes or rings f* on their lower ends, for the reception ot' the bosses through which the. clamping-screws pa-ss, and at their upper ends, f i, threaded, and receiving a cross-bai', Ft', havingca V-shaped, or chisel-edge f t", for a bearing-sin'iace, and adjusted on said screws j`* by nuts fi. The tool to which it is applied, is thatI patented by J. E. Emmerson, and the one to which my improvements primarily have reference.

Either the spiral or straight cutters may, when desired, be provided with latitudinal, spiral, or irregular circumferential corrugations, or grooves, to adapt the tool for ditl'erent purposes.

My diiercnt improvements are applicable to other gnmmers, and their form may be further modified, as

required or preferred, without departing from the principie of the invention.

Having thus described my invention,

I claim as new therein, and desire to secure by Letters. Patent- 1. The combination of the bail F F*', rotary cutter C, andlever A2, employed substantially as and for the purpose set forth.

2. The bail F, when provided with a. V, or chisel-shaped bearing-surface, j, substantially1 as and for the purpose set forth. I

3. The adjustable frame,ror carriage. B, Whenemployed in combination with the gumming-roller, or cutter O of a. sew-gummer, in the manner and for the purpose specified.

4. The clamping-screws G G', in combination with the perforated frame A a* and perforated bail F f', substantially as described.

To the above specification of my said invention, I have signed my hand, this 9th day of July, A. D. 1868.

NELSON JOHNSON.

Witnesses:

S. COUNTRYMAN, A. B. SIMPSON. 

